TI moves to switch capacitor architecture for AC-DC linear regulator

March 26, 2019 // By Rich Pell
TI moves to switch capacitor architecture for AC-DC linear regulator
Texas Instruments (Dallas, TX) has launched an AC-DC linear regulator that achieves the best balance between high efficiency and ultra-low noise while shrinking power supply size.

The TPS7A78 delivers 75% efficiency and provides twice the power density of other linear regulators by using a switched-capacitor architecture to eliminate discrete components such as external inductors and transformers and miniature circuit breakers and interrupters for tamper-resistant designs in applications including electronic metering in grid infrastructure and building automation.

The TPS7A78 is a non-isolated linear regulator that delivers up to 0.5 W regulation through an active bridge, switch capacitor, and integrated low-dropout regulator (LDO), its smart design, says the company, results in higher efficiency and a reduced capacitor size compared to linear regulators in traditional capacitor-drop designs that use a Zener diode.

The TPS7A78 offers the following key features and benefits:

  • Low standby power: A unique dynamic active bridge clamp pre-regulates the input voltage for optimal performance to reduce standby power to 10 mW, which is up to 75% lower compared to traditional capacitor-drop solutions.
  • Higher power density: The switched-capacitor architecture eliminates up to 26 discrete components, including the bridge rectifier. This architecture reduces capacitor size by 25% compared to traditional capacitor-drop solutions.
  • Tamper-proof design: The TPS7A78 is free of costly magnetic shielding, thus meeting the International Electrotechnical Commission (IEC) 61000-4-8 standard required by applications such as electronic metering. To see how power supply designers can help meet system electromagnetic compatibility requirements using the TPS7A78, see " How to make a simple nonmagnetic AC/DC power supply ."

The TPS7A78 is offered in a 14-pin, 5 x 6.5-mm thin-shrink small-outline package (TSSOP) and priced in small reels at $1.00 in 1,000-unit quantities.

Texas Instruments

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